You can try only with odin....with *.tar at the ond of file name in AP section
I've been trying calibration methods with no success I guess I'll clean install again from Beyond Rom idk
IF you have the non-US version, you can root it, otherwise nope.
Select this like in pic and set fast charge on system battery settings. I dont have problems with charging...maybe kernel detects unstable power in charger and slowing down charge proces.